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곱셈: 2 x 12X7

		2	7
			3
		8	1

		1	8
			5
		9	0

	5	3
		5
2	6	5

	5	1
		4
2	0	4

	2	8
		6
1	6	8

	5	5
		6
3	3	0

		1	3
			2
		2	6

	6	0
		8
4	8	0

		2	1
			2
		4	2

	6	0
		3
1	8	0

	7	2
		9
6	4	8

	2	7
		5
1	3	5

		3	7
			2
		7	4

	3	6
		3
1	0	8

	6	2
		6
3	7	2